How to find Subdomains of a Domain in Minutes?

Discovering subdomains of a website is a necessary a part of this hack reconnaissance, and because of following on-line instruments, which make life simpler.

Having an unsecured subdomain can put your corporation at severe threat, and lately there have been some safety incidents the place the hacker used subdomain tips.

The latest was Vine, the place the total code was out there for obtain from a weak uncovered subdomain.

If you’re a web site proprietor or safety researcher, you should utilize the next instruments to seek out the subdomains of any area.

Subdomain lookup instruments

Subdomains Lookup instruments of the WhoisXML API permit customers to simply uncover the subdomains of a website identify. The subdomain product line is fueled by an intensive repository containing over 2.3 billion subdomain information, with greater than 1 million subdomains added each day.

subdomain lookup

The instruments make it attainable to look at any goal area identify and reveal the record of all subdomains discovered for the area, with timestamps of the primary time the report was seen and the final replace for a selected report.

The product line consists of one/one:

  • API with output queries in XML and JSON codecs for straightforward integration
  • Information feed of information out there in uniform and constant CSV format, up to date each day and weekly. Obtain the CSV pattern to check the information in your surroundings
  • GUI lookup instrument that creates experiences with shareable hyperlinks

View this product sheet to see how the WhoisXML API subdomain knowledge can meet particular knowledge necessities.

Legal IP

Legal IP is an rising safety OSINT search engine with a revolutionary IP-based search system and monitoring know-how. Area Search is a legal IP handle characteristic that scans goal domains in real-time and gives complete details about that area with 5-level closing threat rating, phishing chance detection, assigned IP handle, actual IP handle, tech stack , redirection, DNS report, certificates, and many others.

Criminal IP

This service has the additional benefit of the scan detecting beforehand unknown subdomains of a given area and displaying them to customers for straightforward viewing. As soon as a sure URL is scanned, Chrome launches to carry out scans and AI-driven evaluation, diagnosing whether or not URLs are malicious and blocking them accordingly. This service presents direct URL searches, focused key phrase searches, and easy-to-use filters to assist customers discover what they want.

DNS dumpster

DNSDumpster is a website analysis instrument to seek out host associated data. It’s the undertaking.

Not only a subdomain, but it surely offers you details about your area’s DNS server, MX report, TXT report and glorious mapping.



An internet instrument to seek out subdomains utilizing Anubis, Amass, DNScan, Sublist3r, Lepus, Censys, and many others.


I attempted NMMAPPER for one of many domains and the outcomes had been correct. Go forward and provides it a strive to your analysis work.


Sublist3r is a Python instrument to seek out subdomains utilizing a search engine. Presently it helps Google, Yahoo, Bing, Baidu, Ask, Netcraft, Virustotal, ThreatCrowd, DNSdumpster and PassiveDNS.

Sublist3r is simply supported within the Python 2.7 model and has few dependencies in a library.

You need to use this instrument on Home windows, CentOS, Rehat, Ubuntu, Debian or some other UNIX based mostly working system. The next instance is from CentOS/Linux.

  • Login to your Linux server
  • Obtain the newest Sublist3r
wget .

Extract the downloaded file

  • A brand new folder will likely be created known as “Sublist3r-master”

As I discussed earlier, it has the next dependencies, and you’ll set up it utilizing a yum command.

yum set up python-requests python-argparse

Now you might be prepared to find the subdomain utilizing the next command.

./ -d

As you’ll be able to see, it found my subdomains.


Netcraft has a lot of area databases, which you do not wish to miss when on the lookout for public subdomain data.

netcraft subdomain

The search consequence consists of all domains and subdomains with first seen, netblock, and working system data.

When you want extra details about the web site, click on on the location report. You’ll then get quite a lot of details about applied sciences, rankings, and many others.

netcraft results


Detectify can scan subdomains based mostly on a whole bunch of predefined phrases, however you’ll be able to’t do that for a website that you do not personal.

Nevertheless, in case you have licensed a consumer, you’ll be able to allow subdomain detection within the Overview beneath establishments.

detect subdomain


SubBrute is without doubt one of the hottest and correct subdomain enumeration instruments. It’s a neighborhood pushed undertaking and makes use of the open solver as a proxy in order that SubBrute doesn’t ship site visitors to the area’s nameservers.

It isn’t an internet instrument and you might want to set up it in your pc. You need to use a Home windows or UNIX based mostly working system and set up may be very simple. The next demonstration relies on CentOS/Linux.

  • Log in to your CentOS/Linux
  • Obtain the newest SubBrute
wget .
  • Extract the downloaded zip file

A brand new folder will likely be created known as “subbrute-master”. Go to the folder and run with the area.


It takes just a few seconds and ends in a discovered subdomain.


Knock is one other Python-based subdomain discovery instrument examined with Python 2.7.6 model. It finds the subdomain of a goal area utilizing a glossary.

  • You may obtain and set up this on a Linux based mostly working system.
wget .
  • Unzip the downloaded zip file with the unzip command
  • it’s going to unzip and create a brand new folder,”knock-knock 3.
  • Go to this folder and set up with the next command
python set up

As soon as put in, you’ll be able to scan for subdomains as follows


DNS Recon on Kali Linux

Kali Linux is a wonderful platform for a safety researcher, and you should utilize DNSRecon on Kali with out putting in something.

It checks all NS information for zone transfers, international DNS information, wildcard decision, PTR report, and many others.

To make use of DNSRecon, run the next and also you’re finished.

dnsrecon –d

Pentest Instruments

Pentest instruments seek for subdomains utilizing a number of strategies comparable to DNS zone switch, DNS dictionary-based enumeration, and public search engine.

pentest subdomain

It can save you the output in PDF format.


If you wish to resolve domains in bulk, MassDNS is the instrument for you. This instrument can resolve greater than 350,000 domains per second! It makes use of publicly out there resolvers and is appropriate for individuals who wish to resolve hundreds of thousands and even billions of domains.

Supply: Github

One downside you might face when utilizing this instrument is that it could improve the load on public solvers and trigger your IP handle to be flagged for abuse. Due to this fact, this instrument needs to be used with warning.

OWASP Accumulate

Amass was created to assist data safety professionals map assault floor networks and uncover distant property.

OWASP Collect
Supply: Github

The instrument is totally free to make use of and its clientele consists of main IT firm Accenture.


Through the use of the instruments above, I hope you’ll be able to uncover subdomains of the goal area to your safety analysis. You might also wish to strive an internet port scanner.

When you’re excited about studying moral hacking, try this course.

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